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Home Assistant data is too large for one host when growth, maintenance peaks, backups, or recovery exceed measured storage and time budgets.

Home Assistant can use a reverse proxy at a hostname root, but rewriting it under a subpath commonly breaks assets, WebSockets, and callbacks.

Use an isolated probe directory on the same mount to test Home Assistant write access without editing configuration, databases, or live media.

Tune an external Recorder database from measured active connections and latency, not by raising max connections or copying another host's pool.

Use traces and unique operation keys to make automations and imports safe to retry without producing duplicate actions or records.

Recover from a full Recorder volume without deleting evidence first, then reduce growth and prove history and automations survive restart.

Match the runtime UID and GID to the host path, repair only the affected files while stopped, and verify ownership after recreation.

Prove which config and database the running container uses, then isolate mounts, instances, clients, and migration state without deleting evidence.